Electric-arc lamp.



No. 657,432. Patented sept. 4, |900.

y .L mallen.

ELECTRIC ARG LAMP.

(Application led Apr. 2, 1900.)

(No Model.)

5 Sheets-Sheet I.

ff; VW 5 la@ a ATTO/UVE K' Patented Sept. 4, |900. J. MELZER.

ELECTRIC ARC LAMP.

(Applicmn med Apnea, 1900.)

5 Sheets-Sheet 2.

(No Modal.)

NI/ENTOR.

A TTORNE Y.

me Nonms Pneus co, Pnoouwa, wnsmnmm.. n. c.

.1. MELzEn.

ELECTRIC ARC LAMP.,

(Application iled .L-pr. 2, 1900.`

(No Model.) 5 Sheets-Sheet 3.

ISS*

Wim/5555s VEA/*fo R.

6L. VLM/MAW 14.5.@

A TTORNE Y. l5 5* mmm warmem". n. c.

No. 657,432. Patented Sept. 4, |900.

J. MELZER.

ELEGTRIQ ABG LARP.

(Application filed Apr. 2, 1900.)v

(No Medel.) 5 Sheets-Shui 4.

WTNESSES: [NI/ENT'OR. mmm-mn 17, WWW MW A TTU/UVE Y.

m: :mums Pinus no. Pham-uwe wAsnmmoN, o. c.

No. 657,432. Patented Sept. 4, |900.

- J. MELZER.

ELECTRIC ARC LAMP.

(Application led Apr. 2, 1900.) (No Model.) 5 Sheets-Sheet 5.

IIN 1.

...Nur

Illlii.

ATTORNEY.

UNITED' vsmeg' PATENT OFFICE.

JOSEPH MELJZEIR, OIE CLEVELAND, OHIO, ASSIGNOR THE INTERSTATE ELECTRIC COMPANY, OF SAME PLACE.

Li-:cTRic'fARc LAM e.

SPECIFICATION forming' part of Letters yPatent No. 657,432, dated September 4, 190.

Appimemiealipriiz,1900. semiNo. 11,153. (un model.)

To (LZZ 1077/017?, t may concern.'

Be it known that I, JOSEPH MELZER, a citi-` zen of theUnited States,residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented new and useful Improvements in Electric-Arc Lamps, of which the following is a specification.

My invention relates to improvements in electriclarc lamps, and it appertains to the special features pointed outin theannexed' claims.

The object of my present invention is to pro- 'v duce an electric lamp that shall be serviceable on circuits of Widely-varying voltages. It is equally applicable for use on tive-hundredvolt circuits as on one-hundred-and-ten-volt' circuits. Hitherto it has been' deemed impracticable to use a single arc-lamp in parallel connection on a iive-hundred-Volt circuit without using a very7 large energy-consu ming rheostat in series with the lamp, thus making the most ineflcient combinationfor arc-lampillumination purposes, but forming a most efficient electric heater onaccount of. the large amount of energy that must be 'dissipated in the form of heat. This sort ot a combination is manifestly impracticable with an arc of about one and three-ei ;hths inches in length or when burning on a one-y humlred-and-ten-volt circuit with an arc of only about three-eighths of an inch in length.

The reason I am able to produce a magnet that is adaptable to such wide variations of voltage is that I form the magnet-spool with' a head of high magnetic permeability, from which there depends a hollow hub of large radial extension and great cross-sectionaly area. To the hub is secured-a hollow .tube

of high magnetic reluctance, having a re" duced radial extension and consequent reduction of cross-sectional area. To the tube is secu red the other head of the magnet or spool. This is of high magnetic permeability. The

tension as the armatures. :to solenoid-magnets; but I have found this depending hub extends into the wire-space to' such an extent that more than iifty per cent. of its cross-sectional area around the tube is occu pied with Wire which is nearer the magnetic axis than 'that wound around the depending hub. Taking the crosssectional area of the armature which is placed within the tube as 1, then the relative area of the `tube will approximate .92. and the area of the depending hub will approximate relatively 2.25.

Heretofore it has been the practice to construct cores of magnets with equal radial ex- Reference is had form of construction impractic'able for both one-hundred-and-ten and {ive-hundred volt work, as the arc when drawn is maintained inconstant, soon breaking because of the great magnetic density axially coincident with the armature. Withnmy construction vthe path of magnetic lines between the permeable head and armature is a more or less ldiagonal one, thereby making the same magnet adaptable to high or low voltages. conical cores and armatures the predominat- With ing lines are substantially parallel with the p armatu re-axis, the only modification of mag- 'netic density being produced by a lengthening of the air-gap between the core and armature. Consequently for longarc work the armature is soon out of the field of necessary density to maintain the armature in working position, when the result will be only successions of pumpings. If the relation of the parts were made such as to accommodate a long arc, then they would not be properly disposed for maintaining a short arc. My lamp operates practically on five-hundred-volt circuits, with an arc of about one and threeeighths inches in length, under imperceptible feeding periods at as high a relative efficiency as when on a low-voltage circuit. `netizingforce is the same whether used at Aone hundred and ten,two hundred and twenty, `or tive hundred volts. yof only .55 to 1 ampere used at five hundred The mag- The smaller current volts produces the same magnetizing force as at one hundred volts by using more ampereturns on the magnet. This Arelation follows laws of electromagnetism Well known and IOO nnderstood. Since the same magnetizing force is used in all cases, the magnet may be said to be the same for all conditions.

In the accompanying drawings, Figure 1 is a partial sectional View in elevation of an electric lamp embodying the features of 1ny invention. Figs. 2, 3, e, and 5 are diagrammatic views showing the relative positions of the different cooperating parts under onel1undred-and-ten, two-hundred-and-twenty, and live-hundred volt conditions. Fig. G is an enlarged cross-section in elevation of the magnet construction and clutch-operating mechanism. Fig. 7 is a cross-sectional elevation of the central portion of the magnet, showing the iiexible cable connection to the upper carbon when the carbon is in its lowest position. Fig. 8 is a sectional view showing the relation between the arc-striking stop., the carbon-terminal cap, and the armature. Figs. 9, 10, 11, and 12 relate to the positivecarbon-terminal cap. Figs. 13 and 14 relate to the flexible cable connections and the arcstriking stop. Fig. 15 relates to the carbonterminal cap when a new carbon is being placed therein. Figs. 16 and 17 relate to the means for adjusting the clutch-pan. Figs. 1S, 19, and 2O relate to the adjustments for the lower-carbon bracket or supporting rod. Figs. 2l, 22, 23, 24, 25, and 26 show the globeholding mechanism with itsinterrelated parts.

In order that the ditferent parts of the lamp may be easily followed, I have selected a series of index-figures, which always precede the reference-letters, so as to locate the different parts more readily. These index-ligures and the parts to which they refer are as follows:

1 represents the lamp-base, which is placed between the magnet and the ring that supports the outside globe.

2 represents the lower-magnet head.

3 represents one-half of the magnet-spool, a brass tube which serves as a guide for the armature and in connection therewith forms adash-pot. Lis the upper-magnethead,which has a depending hollow hub that forms the other half of the magnet-spool- 5 is the limit-stop tube that determines the are-striking distance.

6 is the suspension-tube that joins the arc feeding and regulating mechanism to the rheostat-frame.

7 is the rhcostat-frame and the different connections.

3 and 9 are the suspension ends from whie-h the lamp is suspended.

10 is the magnet winding and terminal connections.

11 is the armature that slides within the tube 3 and which controls the clutch meehanism.

12 is thel positive or upper carbon terminal cap, which slides down through the tube G, the stop-tube 5, and the armature 1.1.

13 is an exterior globe-ring detachable from the base l.

14 is the outside globe, which is supported from 13.

15 is the bracket or rod that is insulated and depends from 1 to support the lower carbon and the arc-inclosing globe, as well as the clutch-pan mechanism. This rod is in two parts.

16 is the clutch-pan device, which releases the carbon from the clutch when it is necessary to feed the same.

17 is the tube connecting the armature to the clutch.

18 is the inner-globe holder, which is pivlotally held by 15.

19 is the inner globe supported on 1S. 2O is the lower carbon, also supported by l S.

2l is the upper carbon, regulated by the clutch-lever 17m.

22, 23, 24, and 25 are the several sheet-- ine-tal ornamented inclosing casings.

Dekoled description.

1 is thebase. It comprisesallaringdcpending flan-ge in which inwardly-projecting pins 1g are fastened. These pins serve to hold the annular globe-supporting ring 13. A hollow hub 1 is cast onto the base, and a tie-tube 1l is also cast thereon. The tube 1) is integral with the flange lcand the hub 1n. Flange 1 is separated and insulated from head 2 by bushings 1. The hub 1*FL is also insulated from the tube 3f by insulation 1C. Screws 1" serve to hold ring 13 in position against being raised, thereby holding it on the pins 1 very securely. A boss 1i depends from the lower 'side of 1. Within this boss is an insulated sleeve 1h, which surrounds the clutch guiderod 170.

2 is the lower-magnet head, made of highlypermeable material. It screws on the threaded hub 3b up to and against the Flange 3c. This head rests on bushings l, that are clamped between 2 and flange 1C by screws 2C. These screws pass through bushings 2" and 1l and thread into flange 1. A hole 2n alfords passage for the insulated terminal tube 7i, which i-ncloses the connecting-wire from the rheostat to the lower carbon.

3 is a brass tube forming the lower half of the magnet-spool, Fig. G, which is of less diameter than the upper half 43. This tube has formed an enlarged head or end 'lwhich is threaded and fastens in the screw-threads 4g. Aboutmidwayofitslengthscrew-threads 3b are formed, upon which the head 2 is secured. After the head is screwed into place the metal of tube 3 is spun over at 3C to prevent the parts from having movement with respect to each other. The metal of e may be similarly spun over the head 3 for the same purpose. At 3(l the hole of tube 3 is enlarged. This forms a dash-pot having the usual functions. In order that the tube 3 may be long enough to accommodate the armature 11 in its extreme downward position, it is extended at 3f through the insulationbushing 1c.

This form of construction in- IOC) IIO

IZA,

sures the Apermanent alinement of the working parts of the lamp.

4 is the upper head of the magnet. Itis made ot' highly-permeable material, and it has a depending hollow hub which forms the upper half of the magnet-spool. This hub 4 supports the vbrass tube 3 by screw-threads 4g, Fig. 6. At 4h the hub is enlarged internally, so that the armature shall not touch the hub rwhen the armature is at the highest position of its movement-when drawing a fivehundred-voltare. Thehead4hasformed on its upper face a short hub which projects to one side at 4k, forming a boss upon which the terminal screws 4e and 4d are secured. The screw 4d secures the magnet-terminal 10b against plate 4i, and the screw 4C holds terminal end 4f of iieXible cable 12a against the same plate. Screws 4b are conical-ended. They pass into threaded holes in the short hub of the head 4, and their ends will engage any one of the V -grooves 5d. By means of the V-grooves the arc-striking stop 5 is easily adjusted to its proper predetermined position, and when so adjusted the lock-screw 4C assists screws 4b to support the weight of the lower portion of the lamp. Screw 4c enters groove 5C, thereby preventing the tube 5 from turning in the head 4. At one side of the head a slotis formed at 4l, so as to allow the insulating-tube 7i to pass therethrough.

5is an arc-striking limit-stop. Itis tubular in form, having a flange atits upper end and a tubular extension 5b of the same diameter as the armature 11. This tube enters the hole of head 4. Its bottom end forms a stop which limits the length of the arc the armature can draw. Below the head a series of V-grooves 5l is formed. For ease of construction these grooves are extended around the entire circumference, Figs. 6, S, and 14. On one side of the Lipper face of the head, at 5f, agroove is formed to accommodate the iiexible cable 12, A second groove 5C is formed lengthwise of the whole inside of the tube. This groove registers with the iirst one 5f. In order that the grooves 5f and 5c shall always face properly, a groove 5c is formed on the opposite external surface, where it is engaged by the screw 4.

G is a suspension-tube that threads into tube 5,where it is held from turningbyscrew 5,- Figs. 13 and 15. v This tube joins the rheostat-frame 7 with tube 5. It has a slot (5a formed therein, and an inner tube Gb is fastened in it. The tube Gbformsa stop against which the carbon-cap 12 can abut while the lamp is being trimmed and a new carbon is being inserted.

7 is a rheostat-frame havinga hub 7a formed thereon. Tube screws into this hub, and suspension-bolt 8 and nuts S connect it with the suspending-head 9. 7c are secured to and insulated from the frame 7. 'The negative terminal connects with 7h and the positive terminal with 7, Fig. 1.

Binding-posts 7b and Binding-post 7b also connects with the rheostat-coils 7d, and 7c connects by wire 10fl with magnet lO. The coils 7d are threaded through the insulators 7f, which are held by frame 7. Lugs 7g depend from the frame 7. From screws 7G, placed in these lugs, sheet-metal casings 22 and 23 are supported. Theunnoted end of the rheostat-wire 7d leads by 7h through tube 7i to the bracket l5, thus making connection with the lower carbon.

8 is a short threaded connecting-bolt between 9 and 7a. It and the nuts 8 serve to form a strong verticalextension to the hub7 for the easy attachment of the suspensionhead.

9 is a suspension-head threaded upon 8. It supports an insulator, as shown in Fig. 1, around which the suspension-eye 9n is formed.

10 is the magnetwinding, which comprises the wire on the magnet-spool 3 and 4a and the leading-in wire 10 and the leading-out wire 10". Thin asbestos or other insulating material 10C is placed between the wire and the parts 2, 3, and 4, Fig. 6. There are a number of eXtra layers of wire ueaper the magnetic aXis around the highly-reluctant tube 3 than there are around the highly-permeable hub 4 of head 4. This construct-ion enables me to produce a magnet that will properly draw the arc, feed the carbon by lowering of the armature the distance the arc is long, and subsequently control the clutchfeeding of the carbon to maintain an are of constant length, whether subjected to one hundred and ten or tive hundred volts, with a steadiness of action as pronounced in the one case as the other. The lamp, on account of this facility of adaptation, is easy to construct for these. widely-varying conditions with a certainty of practical result hitherto only approximated, as only a change in size of wire on the magnet and rheostat is needed to adapt the lamp to the varying conditions stated. All other parts of the ampare adapted by the various adjustments described.

11 is the armature that strikes the are, feeds the carbon the length of the arc, and then controls the clutch-feed so as to hold the length of the arc constant. It has a hole 1 1b, in which carbon-cap 12 slides. A groove is formed lengthwise of the armature at 11, Fig. 12,t.o accommodate a corresponding projection of the cap 12. The lower end of 11 is formed of a reduced diameter 11, which forms an alining-guide for the dash-pot plunger 17 as it is screwed on the portion 11C. The various positions of the armature are approximately shown in Figs. 2, 3, 4, and 5 that obtain when the lamp is operated under the different conditions, with the relative positions ot' the interrelated adjustments also shown.

12 is the upper-carbon-terminal cap, which has a hole 12d formed therein. This hole is bounded with spring side walls that. hold the carbon 21. A small hole 12b admits the end ot' a flexible cable 12, Fig. 6. This cable passes through slot 12e before entering hole IOO IIS

fi. eta/.1.52

12, where it is held by set-screw 12, whose head passes into a counter-bored hole formed in the radial projection 121, Figs. 9, 10, and 11. The cap is held against turning by the projection 12f, which slides in the slot 6,and `grooves 5 and 11, thereby drawing the cable 12 through the slots G aud 5f centrally.

13 is the outerglobe supporting ring,which comprises a central portion cast integral with an upwardly-flaring Vflange 13, that passes within the depending portion of the base 1. A downwardly-projectiug flange 13 is also formed thereon and globe-holding screws 13f are threaded therein. The upper flange 13(l is cut away at 13 to admit pins 1g, and the cutting in depth proceeds to 13, From this point a lateral slot leads into 4an enlarged opening which is partially separated from 13 by a hook end 13C, that prevents the accidental displacement of ring 13 from off pins V1'r before the set-screws 1f are screwed up.

11ic is the outer globe, that has a curving flange 14, that rests upon the supportingscrews 13f ofthe ring 13.

15 is the bracket, extending from the base 1 tothe inner-globe holder18. 1t is insulated from 1 at 15 between the fastening-flanges 15". The holding-screw 15C is also insulated therefrom. Vire 15, which is a continuation of 7, terminates in 15, thus forming electrical connection from the lower carbon to the rheostat. The bracket 15 extends about the half of the distance to 18, and it has its continuation in rod 15, which is adjustably secured thereon. Clutch-pan support 1U is secured on 15 aboutmidwayof its length. It has a grooved head with sides 16, that slide on the bracket or rod 15, Figs. G and 16. A thumb-screw 15 holds the clutch-pan support against 15. This screw has movement in slot 15c as the support 1G is raised or lowered. A projection 15d is graduated 110, 220,7 500, so that by means ofthe index-face 16 the position of the adjustment may be seen at any moment. In order that the adjustment of 16 may be more positively maintained at predetermined points, depressions 15f are formed in 15. Screw 16 has a conical end that seats in these depressions. A stop 15y limits the downward movement of 16, thus preventing the accidentallengthening of the are to such an extent that the armature will be abnormally lowered and carbon-cap 12 is no longer of su'tticient length to bridge across from 5 to 11, Fig. 8. Below this point bracket 15 swerves to one side and terminates in side walls 151. One of these side walls has formed thereon a boss 15, in which a screw 15l is placed. The edge of the screw-head projects beyond the inner face of flange 15J' into round grooves 15, formed in 1511. Screws 15 are also secured in 15. These screws pass through slots 15, and they serve to keep the parts 15 and 15" together. An index-face 15O is formed at the upper extremity of 15, which in connection with marks 110, 220, 500 show at what position the bracket extension 15 is placed. Screw 15l limits the adjustment to predetermined positions when it is screwed home. A shoulder 15, formed on 15, limits the upward movement of 15. The bracket extension 15 is rounded at 15", and it has a flange lsformed thereon. This 'flange has stops 15, which eoact with pin 18, limiting the distance 18 can be swung around laterally. Below the liange 15H a round projection 15t is formed, upon which 18 is adjustably secured. A washer 15" and nut 15"", screwed onto 15, hold 18 against the shoulder 15S.

1G is the clutch-pan support, which has a side projection,with flanges 1G formed thereon, between which the bracket 15 is held in place bythe screw 15. An index-face 1li shows the position ot' parts, and a screw 1Gb holds 16 at predetermined positions. Con centric with the carbon 21 support 16 has formed thereon a ring 1G, which has a hole 16, through which the carbon 21 passes without engagement therewith. Above this ring the clutch-pan 161r is placed, insulated by 16l from and secured to 1GC by screws 1G. A hole 16" is formed in 15T, through which the carbon 21 passes. The under side ot the clutch-pan is formed into a reflecting-surface 1Gf. This surface at 1br is discontinuous where a slot is formed to tree 1tg from 10, Fig. 16.

17 is the clutch-mechanism tube, connected to the armature 11. This tube has a shoulder 17, that abuis against 11 as the plunger 17 is screwed into 11. Hub 171 is screwed onto the tube 17. A lateral extension 17, Fig. (j, supports the guide-rod 17C, which slides into 1. This rod has a shouldered end 17 and is held in place by a nut 17g. A spring 17 is clamped' under nut 17S'. This spring gently presses against square-headed screw 17, so as to prevent jarring from feeding carbon 21. The spring 17 has a downward projection which prevents the screw 17 'from changing the position into which it is adjusted. The screw 17i is held by post 171, which in turn rests upon 17, Fig. 17. Under 17 17 is formed, rounded so as to touch 1Gb' only at a point when clutch-lever 1.71 needs to be released. 17k are side projections cast onto 17 and with 17 add considerable weight to its outer end. The lever 17 has a hole 17, one side of which, 170, engages carbon 21 in connection with carbon-encircling ring 17S, and its flange 17t holds the carbon from dropping until released, when 171 engages 16g. The other end of 17' is slotted, forming side portions 17, through which the pivot-pin 17l passes. This pin is supported by depending bracket 17 from a side projection of 17l.

18 is the inner-globe and lower-carbon support. It has a hub 18, that encireles 15.

This hub is split at 18, lforming threaded cheek 18c and screw abutting cheek 18, against which clam ping-screw 18 seats itself. The threaded portion of this screw 18" is about A pin 18 abuts stops coextensive with 18C.

IOO

IIO

15X, thus bringing 18 in position where its carbon-axis corresponds with the armature-'axis in one position and in the other prevents 18 from turning around 15t beyond the fixed point15x Whileremovingtheinnerglobe. The hub 18h is concentric with carbon 20, and it is slotted at 18, forming threaded cheek 18 for screw 18m. The other cheek 18k allows the screw-head 18l to abut against it, thereby affording means for clamping the lower-carbon holder 18W to any desired degree. The hub 18h is threaded with a coarse pitch rounded thread to conform to the thread of the carbon-holder 18W, which terminates in a thumb-nut end below 18 and in a tube with spring sides within globe 19. Grooves 18n give elasticity to the sides of 18h. An upper progection 18o supports head 181. This head has a hole 18q for the passage therethrough ot the. upper end of the carbon-holder. This head is threaded externally. It has a recess for cushion 18V, with sloping boundary wall 18".. It also has a beveled face 18S, against which springs 187A lie. A screw-cap 18i, with beveled'face 18, abuts the springs on their upper side. An inelastic ring 18X is formed with a stitfening-rim and with several radial progections, Which serve to hold the ring about central Within cap 18h Two of these progections have slots 18Y,in which the springs 1874 are held. Springs 18",l Fig. 25, are wound straight, and when threaded over ring 18x they assume position shown in Fig. 26, whereby the bottom of the globe 19 is overlapped bv the center portion of the springs sufficiently to give considerable stability to the globe before the cap 123t is screwed down. When the cap is screwed down the springs are moved, as shown 1n Fig. 24. With a continuous spring-ring all 111 one piece this is not possible, and there is nothing to hold the globe until the cap is screwed down, while with my device the globe is held as soon as it is pressed against 18V, thus preventing accidental breakages ot' globes. The carbon-holder 18W can be removed entirely and the clamp-screw 18e loosened and 18 swung around, so that globe 19 can easily be removed.

19 is the arc-inclosing globe, which has a cover-plate 19'L through which the upper carbon has free passage.

2O and 21 are the lower carbon and the upper carbon, respectively.

22, 23, 24, and 25 are the several portions of an ornamental casing. Casing 22 has ventilating-holes 22 formed therein. l

The grooves of the armature and arc-striking stop-tube could equally well be formed on the carbon-terminal cap and a corresponding registering projection formed on the armature and tube Without departing from the spirit of the invention as related thereto. The adjustment of the arc-striking stop and the cliitch-trip into predetermined interrelated positions is made independent of the magnet, so that the Working position of the armature is not modified except by the adjustments referred to.

The term solenoid-magnet as used in this specification is intended to mean an electromagnet of the solenoid variety in which the core is made of magnetic material, such as iron, and the armature adapted to move within the coil and be within the influence of the magnetic core.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. In an arc-lamp, the combination with permeable magnet-heads, oi' a two-part spool therefor, one part of said spool being of permeable material having a large external diameter, and the other part of non-permeable material having a relatively-smaller diaineter, substantially as set forth.

2. In an arc-lainp, the combination with permeable magnet-heads, of a two-part spooltube having about the saine internal diameter throughout its length, one part of permeable material and of large cross-section, and the other part of non-permeable material and small cross-section, substantially as set forth.

3. In an arc-lainp, the combination with an armature-tube of small external diameter, of i an annular disk secured thereon some distance from the end, anda continuation ot' the tube of dissimilar material comprising a liub of large external diameter secured to the end of the armature-tube, said hub terminating in a second disk or head, substantially as set forth.

11. In an arclamp, the combination with an upper magnet-head having a depending hollow hub of large radial dimensions outside of the hole therein, of a tube of dissimilar malterial having a small external diameter and an internal diameter about the same as that of the hub, fastened to the said hub, of a lower magnet-head secu red to said tube about the same distance from the hub as the hub projects out from its head, substantially as set fort-h.

5. A solenoid-magnet comprising a discontinuous spool, one end of said spool being of high magnetic permeability and ot' large eX- ternal diameter outside of the hole formed therein, and the other end of low magnetic permeability and relatively-rediiced external diameter, substantially as set forth.

6. In an arc-lamp, a solenoid-magnet, a discontinuous core comprising one head and about one-half of said core of highly-permeable material the core being of large external diameter, in combination with a second head of similar permeability, and a non-permeable joining-tube of small external diameter, substantially as set forth.

7. In an arc-lamp, a solenoid-magnet having a hollow core therein, a hollow limit-stop within such magnet, a hollow armature operating in opposition to said stop, in combination with means for adjusting tlie stop into different positions, thereby adapting said lainp tooperate under widely-different voltagesfsubstantially as set forth. //"'"S. In an electric-arc lamp adapted 'for use with widely-different voltages, an arc form- 5 ing and regulating armature, a limit-stop determining the length of arc drawn bythe armature, a clutch controlled by the armature,

and an external stop or clutch release, ini combination with means independent of the Io magnet for adjusting the limit-stop and clutch'release to different interrelated posisitions, substantially as set forth.

f). In an electric-are lamp, a movable armature, an arc-striking limit-stop therefor, :a clutch mechanism carried by said armature to control an upper carbon, aclutch-release, and a lower-carbon support, in combination with means independent-of the magnet for adjusting the limit-stop, clutch-release and zo lower-carbon support to interrelated difteront positions, substantially as set'forth.

l0. In an electric-arclarnp, a solenoid-inagnet and a hollow core therein, a limit-tube within the core, a hollow armature movable in opposition to said tube, registering grooves formed in the tube and in the armature, in combination with a sliding carbon-terminal cap having a projection adapted to engage the grooves, Substantially as set forth.

1l. In an arc-lamp, a solenoid-magnet with aihollow core and a limit-tube therein, a-ho'llow armature movable in the core opposite the limit-tube, in combination with alcarbonterminal cap adapted to move in the armature and stop-tube and means for maintaining non-revoluble relation bet-Weensaid Cap and the parts through which the same passes, substantially as set forth.

l2. A globe-holder comprising a base, an adjustable cap thereon and a series of disconnected springs withinthe cap and a common supporting-ring passing through all the springs and constructed to holdthern against longitudinal displacement, substantially as set forth.

13. A globe-holder comprising a base, an adjustable cap thereon, a series of disconnected springs within said cap, a ring passing through the series of springs and notched lugs projecting from said ring and having convolutions of the springs passing through them.

lst. In an arc-lamp, a regulating-magnet, a hollow core therein, a movable armature in said core, an axial opening in `the `armature and a guidewayfin said opening, in combination with a supporting-tube for said magnet. 'having a similar guideway formed therein and means for-keeping the two guideways in axial alinement, substantially as set forth.

`l5. In an arc-lamp, a solenoidmagnet, a supportiingr-tubt and hollow core therefm, an armature movable in said core, a carbon contact-'cap adapted to slide through the supporting-tube and the armature, in combination with stops placed at or vbeyond the ends ol the armature-movement space, adapted to limit the movement `of the carbon-terminal cap, substantially as set forth.

16. A solenoid magnet, comprising` permeableheads,and a permeably-discontin nous core, iin combination with a minimum wire area around the permeableportion of said core and a maximum wire area around the non-permeable portion of said core, substantially as set forth.

17. Asolenoid-magnethavingahollowcore, one portion of said core having a greater external diameterthan the remaining 'portion and a winding on said core having substantially-uniform external diameter from end to end.

18. A solenoid-magnet comprising a coil, a hollow core therein consisting of lpermeable and non-.permeable sections disposed in axial alinement with each other, and an armature.

19. A solenoid-magnet, comprising` a permeablydiscontinuous core, in combination with dissimilar external diameters to said core, substantially as set forth.

20. A solenoid-magnet, a permeably-discontinuous core therein, in combination with maximum and minimum diameters to said core within .the length thereof, substantially as set forth.

2l. In arc-lamps,in combination, a solenoidmagnet, comprising suitable heads therefor and a permeably-discontinuous core formed therein, substantially as set forth.

In testimony whereof I have signed my name to this specification inthe presence of two subscribing witnesses.

JOSEPH MELZER.

Vitnesses:

LEE J. ULLMAN, A. J. NEWMAN.

IOO 

